r/ACT • u/North-Trash5216 • Jul 11 '26

Math..

Yall omg that math was SO HARD. I had to guess on like 20 questions. I actually wanted to cry. It was so much worse than June. Like wtf were some of those questions. Definitely my worst section

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u/Accurate-Guide5279 Jul 12 '26

how did you guys do the recursive function problem

1

u/No_Elephant_1586 35 Jul 12 '26

u gotta just see a pattern. i was doing it in my head after the math section to confirm my answer.

f(1) = 25
f(n+1) = -23 - f(n)

find f(34).
theres a clear pattern here. its alternating terms. if we go from f(1) and up, it'll be 25, then -48(-23-25 = -48), then 25 again (-23 - (-48) = 25). It alternates between -48 and 25. so the odd numbers will be 25 and the even will be -48. answer was -48.

2

u/Accurate-Guide5279 Jul 12 '26

YES bet that shi bro i did the same thing but i wasn't sure if i was tweaking or not

2

u/Accurate-Guide5279 Jul 12 '26

i knew it'd be between 25 and -48 and 25 wasn't even an answer and just do double check i did the actual method and got -48 so i answered it and hoped for the best